HR: 1340h
AN: H43E-1664    [Abstracts]
TI: Predicting The Time And Location For Shallow Landslide Occurrence In Northern Taiwan
AU: * Ho, J
EM: m94520017@mail.ntou.edu.tw
AF: Department of River and Harbor Engineering, National Taiwan Ocean University., Dept. of River and Harbor Engrg., National Taiwan Ocean Univ., Keelung, Taiwan 202, ROC, Keelung, 202, Taiwan
AU: Lee, k
EM: ktlee@mail.ntou.edu.tw
AF: Department of River and Harbor Engineering, National Taiwan Ocean University., Dept. of River and Harbor Engrg., National Taiwan Ocean Univ., Keelung, Taiwan 202, ROC, Keelung, 202, Taiwan
AB: The topographic, geological and hydrologic conditions of Taiwan usually induce landslide and debris flow during heavy rainstorms. Poor geological conditions induce a high potential to cause hillslope disasters, and severe rainstorms often trigger slope collapses. The objective of this study is to link a slope-instability analytical procedure to a watershed runoff model for landslide prediction during heavy rainfall periods. The analytical result can provide location and time for shallow landslide occurrences to authorities for disaster warning and evacuation. In this study, hydrologic records and geological information from the Da-Tsu-Keng watershed and Chon-Ho watershed in Taipei County were collected for analysis. By using the hourly rainfall data, the varying of the water table on the hillslope was simulated using a hydrological model, and the temporal water level was then used in the slope instability analysis to predict instability grids within the study areas. The results show that more than 50% area of the study subwatershed was considered having potential for landslide occurrence during a severe typhoon in November 2000. The predicted landslide region and occurrence time matched well with the field investigation data. It is therefore considered promising to apply the proposed analytical procedure for real- time landslide warning to alleviate the loss of lives and property.
DE: 1800 HYDROLOGY
DE: 1810 Debris flow and landslides
DE: 1816 Estimation and forecasting
DE: 1819 Geographic Information Systems (GIS)
DE: 1829 Groundwater hydrology
SC: Hydrology [H]
MN: 2007 Fall Meeting